Prestage playbook failed due to non-release type directories in /opt/platform-backup

[Li Zhu]

Brief Description
-----------------
The prestage playbook failed in cleanup task because there's a 'lost+found' directory in /opt/platform-backup. Manually removing /opt/platform-backup/lost+found fixes the issue. However, we may need to account for this, because lost+found can get created by fsck: https://www.baeldung.com/linux/lost-found-directory, Non-release type directories have to be filtered out in cleanup task.

Severity
--------
Minor

Steps to Reproduce
------------------
Create a non-release type of directory under /opt/platform-backup, and then running prestage.

Expected Behavior
------------------
Prestage succeeds

Actual Behavior
----------------
Prestage failed in cleanup task

Reproducibility
---------------
100% reproducible

System Configuration
--------------------
DC

Branch/Pull Time/Commit
-----------------------
22.12 + commits from feature - "Subcloud install or restore of previous release - 22.12"

Last Pass
---------
N/A

Timestamp/Logs
--------------
TASK [prestage/prepare-env : Clean up old release(s) (lower than 21.12) prestage data] ***
Wednesday 14 June 2023 12:30:11 +0000 (0:00:00.752) 0:00:09.963 ********
fatal: [subcloud6]: FAILED! =>
  msg: |-
    The conditional check 'item.path.split('/')[-1] is version(minimum_supported_release_version_for_prestage, "<")' failed. The error was: Version comparison: '<' not supported between instances of 'str' and 'int'

    The error appears to be in '/usr/share/ansible/stx-ansible/playbooks/roles/prestage/prepare-env/tasks/cleanup_prestage_dir.yml': line 90, column 3, but may
    be elsewhere in the file depending on the exact syntax problem.

    The offending line appears to be:

    - name: Clean up old release(s) (lower than {{ minimum_supported_release_version_for_prestage }}) prestage data
      ^ here
    We could be wrong, but this one looks like it might be an issue with
    missing quotes. Always quote template expression brackets when they
    start a value. For instance:

        with_items:
          - {{ foo }}

    Should be written as:

        with_items:
          - "{{ foo }}"

Test Activity
-------------
Feature Testing

Workaround
----------
Manually removing the non-release type of directories from /opt/platform-backup.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/ansible-playbooks/+/886530